[Bldg-sim] PSZ-AC

[Kendra Tupper]

I agree with Dan.  The 90.1 User's Manual is a bit more clear on this
subject, and references that a PSZ unit is created for each thermal
zone.

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Dan Russell
Sent: Thursday, September 04, 2008 4:12 PM
To: Eric Youngson; bldg-sim at lists.onebuilding.org
Cc: bldg-rate at lists.onebuilding.org
Subject: Re: [Bldg-sim] PSZ-AC

 

Eric, 

 

I understand System 3 (PSZ-AC) to be a standard packaged rooftop that
may serve multiple "spaces", but only serves a single "thermal zone".
In other words, there is only one thermostat that controls the entire
unit.

 

Your baseline should have a separate PSZ-AC for each thermal zone
depicted by your HVAC drawings.  Note that adjacent thermal zones with
similar load characteristics (light/equip gain, people count, exterior
exposure, etc.) may be lumped into a single thermal zone for modeling
purposes (i.e. less zones = simpler model).

 

Hope that helps.

 

 Dan Russell, EIT 

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eric
Youngson
Sent: Thursday, September 04, 2008 3:33 PM
To: bldg-sim at lists.onebuilding.org
Cc: bldg-rate at lists.onebuilding.org
Subject: [Bldg-sim] PSZ-AC

 

Sim List,

                ASHRAE system 3 is, Packaged Single Zone Air Conditioner
(PSZ-AC). The description of PSZ-AC says, "Packaged rooftop air
conditioner". I assume that this means a single unit serving multiple
zones. This doesn't seem to make sense since the name contains the
phrase 'single zone'.

                I have a building with baseline system 3, PSZ-AC and I'm
not sure how to apply this system. The proposed building has a variety
of systems. Should I have a system per zone or a single unit for the
building?

 

Thanks

 

  <http://www.pae-engineers.com/> 

Eric Youngson 

 

PAE Consulting Engineers, Inc. 



503.226.2921 Main
503.542.0567 Direct
503.226.2930 Fax
ericy at pae-engineers.com 

Mechanical 

808 SW Third Avenue - Suite 300
Portland, OR 97204-2426
www.pae-engineers.com 

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